Examples with IdleSubchannelEntry io.grpc.grpclb.GrpclbState.IdleSubchannelEntry used on opensource projects

Example 1 with IdleSubchannelEntry

use of io.grpc.grpclb.GrpclbState.IdleSubchannelEntry in project grpc-java by grpc.

the class GrpclbLoadBalancerTest method grpclbWorking_pickFirstMode.

@Test
public void grpclbWorking_pickFirstMode() throws Exception {
    InOrder inOrder = inOrder(helper);
    List<EquivalentAddressGroup> grpclbBalancerList = createResolvedBalancerAddresses(1);
    deliverResolvedAddresses(Collections.<EquivalentAddressGroup>emptyList(), grpclbBalancerList, GrpclbConfig.create(Mode.PICK_FIRST));
    assertEquals(1, fakeOobChannels.size());
    verify(mockLbService).balanceLoad(lbResponseObserverCaptor.capture());
    StreamObserver<LoadBalanceResponse> lbResponseObserver = lbResponseObserverCaptor.getValue();
    assertEquals(1, lbRequestObservers.size());
    StreamObserver<LoadBalanceRequest> lbRequestObserver = lbRequestObservers.poll();
    verify(lbRequestObserver).onNext(eq(LoadBalanceRequest.newBuilder().setInitialRequest(InitialLoadBalanceRequest.newBuilder().setName(SERVICE_AUTHORITY).build()).build()));
    // Simulate receiving LB response
    List<ServerEntry> backends1 = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), new ServerEntry("127.0.0.1", 2010, "token0002"));
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    lbResponseObserver.onNext(buildInitialResponse());
    lbResponseObserver.onNext(buildLbResponse(backends1));
    inOrder.verify(helper).createSubchannel(createSubchannelArgsCaptor.capture());
    CreateSubchannelArgs createSubchannelArgs = createSubchannelArgsCaptor.getValue();
    assertThat(createSubchannelArgs.getAddresses()).containsExactly(new EquivalentAddressGroup(backends1.get(0).addr, eagAttrsWithToken("token0001")), new EquivalentAddressGroup(backends1.get(1).addr, eagAttrsWithToken("token0002")));
    // Initially IDLE
    inOrder.verify(helper).updateBalancingState(eq(IDLE), pickerCaptor.capture());
    RoundRobinPicker picker0 = (RoundRobinPicker) pickerCaptor.getValue();
    // Only one subchannel is created
    assertThat(mockSubchannels).hasSize(1);
    Subchannel subchannel = mockSubchannels.poll();
    assertThat(picker0.dropList).containsExactly(null, null);
    assertThat(picker0.pickList).containsExactly(new IdleSubchannelEntry(subchannel, syncContext));
    // PICK_FIRST doesn't eagerly connect
    verify(subchannel, never()).requestConnection();
    // CONNECTING
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(CONNECTING));
    inOrder.verify(helper).updateBalancingState(eq(CONNECTING), pickerCaptor.capture());
    RoundRobinPicker picker1 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker1.dropList).containsExactly(null, null);
    assertThat(picker1.pickList).containsExactly(BUFFER_ENTRY);
    // TRANSIENT_FAILURE
    Status error = Status.UNAVAILABLE.withDescription("Simulated connection error");
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forTransientFailure(error));
    inOrder.verify(helper).updateBalancingState(eq(TRANSIENT_FAILURE), pickerCaptor.capture());
    RoundRobinPicker picker2 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker2.dropList).containsExactly(null, null);
    assertThat(picker2.pickList).containsExactly(new ErrorEntry(error));
    // READY
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(READY));
    inOrder.verify(helper).updateBalancingState(eq(READY), pickerCaptor.capture());
    RoundRobinPicker picker3 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker3.dropList).containsExactly(null, null);
    assertThat(picker3.pickList).containsExactly(new BackendEntry(subchannel, new TokenAttachingTracerFactory(getLoadRecorder())));
    // New server list with drops
    List<ServerEntry> backends2 = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), // drop
    new ServerEntry("token0003"), new ServerEntry("127.0.0.1", 2020, "token0004"));
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    lbResponseObserver.onNext(buildLbResponse(backends2));
    // new addresses will be updated to the existing subchannel
    // createSubchannel() has ever been called only once
    verify(helper, times(1)).createSubchannel(any(CreateSubchannelArgs.class));
    assertThat(mockSubchannels).isEmpty();
    verify(subchannel).updateAddresses(eq(Arrays.asList(new EquivalentAddressGroup(backends2.get(0).addr, eagAttrsWithToken("token0001")), new EquivalentAddressGroup(backends2.get(2).addr, eagAttrsWithToken("token0004")))));
    inOrder.verify(helper).updateBalancingState(eq(READY), pickerCaptor.capture());
    RoundRobinPicker picker4 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker4.dropList).containsExactly(null, new DropEntry(getLoadRecorder(), "token0003"), null);
    assertThat(picker4.pickList).containsExactly(new BackendEntry(subchannel, new TokenAttachingTracerFactory(getLoadRecorder())));
    // Subchannel goes IDLE, but PICK_FIRST will not try to reconnect
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(IDLE));
    inOrder.verify(helper).updateBalancingState(eq(IDLE), pickerCaptor.capture());
    RoundRobinPicker picker5 = (RoundRobinPicker) pickerCaptor.getValue();
    verify(subchannel, never()).requestConnection();
    // ... until it's selected
    PickSubchannelArgs args = mock(PickSubchannelArgs.class);
    PickResult pick = picker5.pickSubchannel(args);
    assertThat(pick).isSameInstanceAs(PickResult.withNoResult());
    verify(subchannel).requestConnection();
    // ... or requested by application
    balancer.requestConnection();
    verify(subchannel, times(2)).requestConnection();
    // PICK_FIRST doesn't use subchannelPool
    verify(subchannelPool, never()).takeOrCreateSubchannel(any(EquivalentAddressGroup.class), any(Attributes.class));
    verify(subchannelPool, never()).returnSubchannel(any(Subchannel.class), any(ConnectivityStateInfo.class));
}

Example 2 with IdleSubchannelEntry

use of io.grpc.grpclb.GrpclbState.IdleSubchannelEntry in project grpc-java by grpc.

the class GrpclbLoadBalancerTest method grpclbWorking_pickFirstMode_lbSendsEmptyAddress.

@Test
public void grpclbWorking_pickFirstMode_lbSendsEmptyAddress() throws Exception {
    InOrder inOrder = inOrder(helper);
    List<EquivalentAddressGroup> grpclbBalancerList = createResolvedBalancerAddresses(1);
    deliverResolvedAddresses(Collections.<EquivalentAddressGroup>emptyList(), grpclbBalancerList, GrpclbConfig.create(Mode.PICK_FIRST));
    assertEquals(1, fakeOobChannels.size());
    verify(mockLbService).balanceLoad(lbResponseObserverCaptor.capture());
    StreamObserver<LoadBalanceResponse> lbResponseObserver = lbResponseObserverCaptor.getValue();
    assertEquals(1, lbRequestObservers.size());
    StreamObserver<LoadBalanceRequest> lbRequestObserver = lbRequestObservers.poll();
    verify(lbRequestObserver).onNext(eq(LoadBalanceRequest.newBuilder().setInitialRequest(InitialLoadBalanceRequest.newBuilder().setName(SERVICE_AUTHORITY).build()).build()));
    // Simulate receiving LB response
    List<ServerEntry> backends1 = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), new ServerEntry("127.0.0.1", 2010, "token0002"));
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    lbResponseObserver.onNext(buildInitialResponse());
    lbResponseObserver.onNext(buildLbResponse(backends1));
    inOrder.verify(helper).createSubchannel(createSubchannelArgsCaptor.capture());
    CreateSubchannelArgs createSubchannelArgs = createSubchannelArgsCaptor.getValue();
    assertThat(createSubchannelArgs.getAddresses()).containsExactly(new EquivalentAddressGroup(backends1.get(0).addr, eagAttrsWithToken("token0001")), new EquivalentAddressGroup(backends1.get(1).addr, eagAttrsWithToken("token0002")));
    // Initially IDLE
    inOrder.verify(helper).updateBalancingState(eq(IDLE), pickerCaptor.capture());
    RoundRobinPicker picker0 = (RoundRobinPicker) pickerCaptor.getValue();
    // Only one subchannel is created
    assertThat(mockSubchannels).hasSize(1);
    Subchannel subchannel = mockSubchannels.poll();
    assertThat(picker0.dropList).containsExactly(null, null);
    assertThat(picker0.pickList).containsExactly(new IdleSubchannelEntry(subchannel, syncContext));
    // PICK_FIRST doesn't eagerly connect
    verify(subchannel, never()).requestConnection();
    // CONNECTING
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(CONNECTING));
    inOrder.verify(helper).updateBalancingState(eq(CONNECTING), pickerCaptor.capture());
    RoundRobinPicker picker1 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker1.dropList).containsExactly(null, null);
    assertThat(picker1.pickList).containsExactly(BUFFER_ENTRY);
    // TRANSIENT_FAILURE
    Status error = Status.UNAVAILABLE.withDescription("Simulated connection error");
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forTransientFailure(error));
    inOrder.verify(helper).updateBalancingState(eq(TRANSIENT_FAILURE), pickerCaptor.capture());
    RoundRobinPicker picker2 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker2.dropList).containsExactly(null, null);
    assertThat(picker2.pickList).containsExactly(new ErrorEntry(error));
    // READY
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(READY));
    inOrder.verify(helper).updateBalancingState(eq(READY), pickerCaptor.capture());
    RoundRobinPicker picker3 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker3.dropList).containsExactly(null, null);
    assertThat(picker3.pickList).containsExactly(new BackendEntry(subchannel, new TokenAttachingTracerFactory(getLoadRecorder())));
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    // Empty addresses from LB
    lbResponseObserver.onNext(buildLbResponse(Collections.<ServerEntry>emptyList()));
    // new addresses will be updated to the existing subchannel
    // createSubchannel() has ever been called only once
    inOrder.verify(helper, never()).createSubchannel(any(CreateSubchannelArgs.class));
    assertThat(mockSubchannels).isEmpty();
    verify(subchannel).shutdown();
    // RPC error status includes message of no backends provided by balancer
    inOrder.verify(helper).updateBalancingState(eq(TRANSIENT_FAILURE), pickerCaptor.capture());
    RoundRobinPicker errorPicker = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(errorPicker.pickList).containsExactly(new ErrorEntry(GrpclbState.NO_AVAILABLE_BACKENDS_STATUS));
    lbResponseObserver.onNext(buildLbResponse(Collections.<ServerEntry>emptyList()));
    // Test recover from new LB response with addresses
    // New server list with drops
    List<ServerEntry> backends2 = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), // drop
    new ServerEntry("token0003"), new ServerEntry("127.0.0.1", 2020, "token0004"));
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    lbResponseObserver.onNext(buildLbResponse(backends2));
    // new addresses will be updated to the existing subchannel
    inOrder.verify(helper, times(1)).createSubchannel(any(CreateSubchannelArgs.class));
    inOrder.verify(helper).updateBalancingState(eq(IDLE), pickerCaptor.capture());
    subchannel = mockSubchannels.poll();
    // Subchannel became READY
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(CONNECTING));
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(READY));
    inOrder.verify(helper).updateBalancingState(eq(READY), pickerCaptor.capture());
    RoundRobinPicker picker4 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker4.pickList).containsExactly(new BackendEntry(subchannel, new TokenAttachingTracerFactory(getLoadRecorder())));
}

Example 3 with IdleSubchannelEntry

use of io.grpc.grpclb.GrpclbState.IdleSubchannelEntry in project grpc-java by grpc.

the class GrpclbLoadBalancerTest method pickFirstMode_fallback.

@Test
public void pickFirstMode_fallback() throws Exception {
    InOrder inOrder = inOrder(helper);
    // Name resolver returns balancer and backend addresses
    List<EquivalentAddressGroup> backendList = createResolvedBackendAddresses(2);
    List<EquivalentAddressGroup> grpclbBalancerList = createResolvedBalancerAddresses(1);
    deliverResolvedAddresses(backendList, grpclbBalancerList, GrpclbConfig.create(Mode.PICK_FIRST));
    // Attempted to connect to balancer
    assertEquals(1, fakeOobChannels.size());
    verify(mockLbService).balanceLoad(lbResponseObserverCaptor.capture());
    StreamObserver<LoadBalanceResponse> lbResponseObserver = lbResponseObserverCaptor.getValue();
    assertEquals(1, lbRequestObservers.size());
    // Fallback timer expires with no response
    fakeClock.forwardTime(GrpclbState.FALLBACK_TIMEOUT_MS, TimeUnit.MILLISECONDS);
    // Entering fallback mode
    inOrder.verify(helper).createSubchannel(createSubchannelArgsCaptor.capture());
    CreateSubchannelArgs createSubchannelArgs = createSubchannelArgsCaptor.getValue();
    assertThat(createSubchannelArgs.getAddresses()).containsExactly(backendList.get(0), backendList.get(1));
    assertThat(mockSubchannels).hasSize(1);
    Subchannel subchannel = mockSubchannels.poll();
    // Initially IDLE
    inOrder.verify(helper).updateBalancingState(eq(IDLE), pickerCaptor.capture());
    RoundRobinPicker picker0 = (RoundRobinPicker) pickerCaptor.getValue();
    // READY
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(READY));
    inOrder.verify(helper).updateBalancingState(eq(READY), pickerCaptor.capture());
    RoundRobinPicker picker1 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker1.dropList).containsExactly(null, null);
    assertThat(picker1.pickList).containsExactly(new BackendEntry(subchannel, new TokenAttachingTracerFactory(null)));
    assertThat(picker0.dropList).containsExactly(null, null);
    assertThat(picker0.pickList).containsExactly(new IdleSubchannelEntry(subchannel, syncContext));
    // Finally, an LB response, which brings us out of fallback
    List<ServerEntry> backends1 = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), new ServerEntry("127.0.0.1", 2010, "token0002"));
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    lbResponseObserver.onNext(buildInitialResponse());
    lbResponseObserver.onNext(buildLbResponse(backends1));
    // new addresses will be updated to the existing subchannel
    // createSubchannel() has ever been called only once
    inOrder.verify(helper, never()).createSubchannel(any(CreateSubchannelArgs.class));
    assertThat(mockSubchannels).isEmpty();
    verify(subchannel).updateAddresses(eq(Arrays.asList(new EquivalentAddressGroup(backends1.get(0).addr, eagAttrsWithToken("token0001")), new EquivalentAddressGroup(backends1.get(1).addr, eagAttrsWithToken("token0002")))));
    inOrder.verify(helper).updateBalancingState(eq(READY), pickerCaptor.capture());
    RoundRobinPicker picker2 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker2.dropList).containsExactly(null, null);
    assertThat(picker2.pickList).containsExactly(new BackendEntry(subchannel, new TokenAttachingTracerFactory(getLoadRecorder())));
    // PICK_FIRST doesn't use subchannelPool
    verify(subchannelPool, never()).takeOrCreateSubchannel(any(EquivalentAddressGroup.class), any(Attributes.class));
    verify(subchannelPool, never()).returnSubchannel(any(Subchannel.class), any(ConnectivityStateInfo.class));
}

Example 4 with IdleSubchannelEntry

use of io.grpc.grpclb.GrpclbState.IdleSubchannelEntry in project grpc-java by grpc.

the class GrpclbLoadBalancerTest method roundRobinPickerWithIdleEntry_noDrop.

@Test
public void roundRobinPickerWithIdleEntry_noDrop() {
    Subchannel subchannel = mock(Subchannel.class);
    IdleSubchannelEntry entry = new IdleSubchannelEntry(subchannel, syncContext);
    RoundRobinPicker picker = new RoundRobinPicker(Collections.<DropEntry>emptyList(), Collections.singletonList(entry));
    PickSubchannelArgs args = mock(PickSubchannelArgs.class);
    verify(subchannel, never()).requestConnection();
    assertThat(picker.pickSubchannel(args)).isSameInstanceAs(PickResult.withNoResult());
    verify(subchannel).requestConnection();
    assertThat(picker.pickSubchannel(args)).isSameInstanceAs(PickResult.withNoResult());
    // Only the first pick triggers requestConnection()
    verify(subchannel).requestConnection();
}

Example 5 with IdleSubchannelEntry

use of io.grpc.grpclb.GrpclbState.IdleSubchannelEntry in project grpc-java by grpc.

the class GrpclbLoadBalancerTest method roundRobinPickerWithIdleEntry_andDrop.

@Test
public void roundRobinPickerWithIdleEntry_andDrop() {
    GrpclbClientLoadRecorder loadRecorder = new GrpclbClientLoadRecorder(fakeClock.getTimeProvider());
    // 1 out of 2 requests are to be dropped
    DropEntry d = new DropEntry(loadRecorder, "LBTOKEN0003");
    List<DropEntry> dropList = Arrays.asList(null, d);
    Subchannel subchannel = mock(Subchannel.class);
    IdleSubchannelEntry entry = new IdleSubchannelEntry(subchannel, syncContext);
    RoundRobinPicker picker = new RoundRobinPicker(dropList, Collections.singletonList(entry));
    PickSubchannelArgs args = mock(PickSubchannelArgs.class);
    verify(subchannel, never()).requestConnection();
    assertThat(picker.pickSubchannel(args)).isSameInstanceAs(PickResult.withNoResult());
    verify(subchannel).requestConnection();
    assertThat(picker.pickSubchannel(args)).isSameInstanceAs(DROP_PICK_RESULT);
    verify(subchannel).requestConnection();
    assertThat(picker.pickSubchannel(args)).isSameInstanceAs(PickResult.withNoResult());
    // Only the first pick triggers requestConnection()
    verify(subchannel).requestConnection();
}